Air heater for indoor use



I July 7, 1936. F. WINTERFEL DT AIR HEATER FOR INDOOR USE Filed NOV. 26, 1935 J22 vazioz': I

Patented July 7, 1936 PATENT OFFICE AIR HEATER ron mnooa USE Franz Winterfeldt, Berlin-Tempelhof, Germany Application November 26, 1935, Serial No. 51,685 In Germany October 9, 1934 6Clalms.

The invention relates to an air heater for heating rooms, with circulation of the air by a fan and air admission at the top and air outflow at the bottom.

According to the invention there are provided on the suction dome, forming the upper part of the air heater, a number of radially extending air suction pipes with downwardly directed suction funnels. 10 By the invention there is adapted to be obtained, in contradistinction to the known air heaters of this ype, that substantially only the-lower layer of air of the room to be heated, in which human beings are located, is circulated and heated, whereas the layer of air disposed above this remains substantially unaffected by the air circulation and also by the heating, which is particularly suitable in high workrooms.

Further according to this invention, the casing an of the air heater is adapted to be adjustable in 'height so that the vertically disposed heating tubes can be more or less exposed at the bottom whereby .it is possible to control the heated air which passes out, and further the heating tubes cah be made readily accessible for cleaning pur- The accompanying drawing shows a side elevation partly in section of one example of construction of the heater.

In accordance with the form of the inventiondisclosed in the accompanying drawing as an ex-- ample, there is provided a furnace A having the spaced upwardly extended and vertically disposed heating tubes B arranged in an annular group surrounding and providing a central vertically disposed air space or passage 3' therewithin. The tubes B are in communication at their upper ends with and discharge the heating gases from the furnace A into an annular chamber or header H. 4B The heating gases or products of combustion are led from the chamber or header H to a suitable chimney (not shown) by a pipe or flue F. Thus, the heating gases from the furnace A ascend through the tubes B, and after giving up their heat to the air between the-tubes and in the central passageB', escape through chamber H and nates at its lower end or edge spaced a distance above furnace A and the lower endsof the heating tubes B to provide for the discharge of heated air outwardly from the lower end of the casing into the room or chamber to be heated. If de- 5 sired the casing G may be mounted for vertical adjustment, in any suitable or well known manner, in order to control the discharge of heated air into the room; and further for the purpose of-providing access to the heating tubes B for in cleaning or other purposes.

At the upper side of the chamber or header H, a suction or intake dome D is provided which in this instance is located axially of. the casing G, and which opens or discharges at its lower end 1 into the upper end of the central air passage B, through the central opening of the annular header H. The central opening through header H forms in eflect a downward continuation of the air intake dome D from which the air is dis- 20 charged into central passage 13' and easing G for flow of air downwardly through the casing around and between the-heating tubes B. Preferably, an air impelling means such as a blower or fan C is mounted in the upper portion of dome 25 D for drawing air into the dome and forcing the air from the dome downwardly through casing G, over and around the heating tubes B.

The air intake dome D is supplied with air to be heated from the room in which the heater is 30 installed, by the suction or air intake pipes E, which in the example hereof, are suitably spaced around and extend radially from the dome, and which discharge into the dome above the blower or fan '0. These air intake or suction pipes E 35 extend from the dome 'D to the desired relatively remote portions of the room, preferably in the upper portion of the room, and in the particular example hereof, terminate in the downwardly directed, enlarged diameter suction funnels, only 4 one of which is shown in the accompanying drawing.

Thus, in operation, air is positively drawn from portions of the room relatively remote from the apparatus through the suction funnels and pipes E, into the suction dome D, and downwardly from the dome over and around the heating tubesB. This downwardly flowing air heated from the tubes B is discharged into the lower portion of the room from and around the lower open side or edge of the casing G. In such manner the air from relatively remote upper portions of a room or chamber is positively circulated and heated and certain advantages as hereinbefore pointed out, with particular reference to large or high ceiling rooms, are obtained.

I claim:

1. An air heater adapted to be installed on the floor of a room to be heated, said heater including a heating furnace, a casing providing a chamber for heating air therein by said furnace, said casing providing a lower side heated air discharge from the chamber into the room above the floor thereof, an air suction dome at the upper side of said casing for receiving air from the room and discharging the same into the casing to be heated, means in said dome for drawing air thereinto and forcing such'air downwardly through said casing, and a plurality of air in-' take pipes for conducting air from the room into said dome, the said pipes extended from the dome to relatively remote locations in the upper portion of the room.

2. An air heater adapted to be installed on the floor of a room to be heated, said heater including an air heating chamber, means for heating air in said chamber, said casing provided with a heated air discharge at and around the lower side thereof but spaced a distance above the floor of the room, an air inlet dome at the upper side of said casing for receiving air from upper end of the air heating chamber formed by said casing, a plurality of air intake pipes extending radially and substantially horizontally from said dome to relatively remote locations in the upper portion of the room at levels spaced above the lower end heated air discharge from said casing, for withdrawing air to be heated from such portions of the room and discharging the same into said air inlet dome, and means for drawing air through said pipes and forcing the same downwardly through said air heating chamber.

3.. An air heater adapted to be installed on the floor of a room to be heated, said heater including a heating furnace, a plurality of vertically disposed heating tubes extending upwardly from the furnace for upward passage therethrough of the heated gases from the furnace,

a casing over and around said tubes'to provide a chamber therewithin for passage of air downwardly therethrough over and around and outwardly between the lower portions of said heating tubes, said casing formed to provide a heated air discharge into a room from and around the lower side of the casing, an air intake dome at the upper side of the casing for discharging air thereinto, a plurality of air intake tubes extending radially from said dome to relatively remote locations in the upper portion of a room to be heated for withdrawing air therefrom into said dome, and meansfor drawing air through said air intake tubes and forcing the same downwardly through said casing over said heating tubes.

4. An air heater adapted to be installed at the floor of a room to be heated, said heater ineluding a furnace, a group of vertically disposed heating tubes extending upwardly from the furnace for passage of the heated gases from the b furnace upwardly therethrough, a casing extending down over and surrounding said group of heating tubes to provide a chamber for passage of air downwardly therethrough over and around the heating tubes, said casing providing a discharge at the lower side thereof above the room floor for passage of heated air outwardly therefrom into the lower portion of the room, a plurality of air intake tubes extending from the heater to relatively remote locations in the upper portion of the room for withdrawing air from such portions to the chamber formed by said casing, and means for drawing air through said tubes and for forcing the air downwardly through said casing for heating by said heating tubes.

5. An air heater adapted to be installed at the floor of a room to be heated, said heater in cluding a furnace, vertically disposed heating tubes extending upwardly from the furnace for passage of the heated gases upwardly therethrough from the furnace, a vertically disposed casing extending down over and surrounding said heating tubes to provide a chamber' for passage of air downwardly therethrough over and around the heating tubes, said casing provided with a discharge at the lower side thereof for passage of heated air outwardly therefrom into the lower portion of the room, an air suction dome extending upwardly from said casing and discharging thereinto at the upper end thereof, a plurality of air intake pipes extending radially and substantially horizontally from the said dome to locations in the upper portion of the room for withdrawing air from such portions and conducting the same into the dome, said pipes provided with downwardly directed enlarged air intakes, and a blower located in said dome below the discharge of said intake pipes into the dome for drawing air through the pipes and forcing such air downwardly from the dome through said casing.

6. In combination in an air heater adapted to be installed at the floor of a room to be heated, a vertically disposed casing providing an air heating chamber therewithin, heating tubes ex tending. upwardly into said chamber for passage of a heating medium upwardly through the tubes, said air heating chamber having a heated air outlet at the lower end thereof for discharging air passed downwardly through said casing over and around said tubes, air suction pipes for discharging air to be heated into the upper portion of said chamber, said pipes extended to relatively remote locations, respectively, at the upper portion of a room and provided with intakes for withdrawing air from such locations to the said chamber, and means for positively drawing air into said pipes through theintakes and for forcing the air downwardly through said chamber for heat exchange with said heating tubes. 

